Features Material: The spring collets are made of 65Mn spring steel, stable, fine workmanship, good elasticity, high precision. Suitable for CNC milling lathe tool and work-holding engraving machine Gripping Range: 15Pcs ER11 Collet Set Range: 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 1/8" ,1/4". Run-Out Tolerance: <0.008mm With Label: Each collet is well packed in separate protective container with label it is easy to distinguish them Please Note: Collet must be placed into collet chuck nut before inserting into collet chuck Widely Used: Our spring collet set can be directly replaced to meet your various needs. Suitable for drilling, tapping, engraving, CNC, spindle machines, and other processing <strong>Description:</strong> These spring collets are made of high quality 65Mn spring steel for CNC milling lathe tool and work-holding engraving machine. Fine workmanship, good elasticity, high precision here are total 15 collets of various sizes in on set which can basic meet your need. Each collet is well packed in separate protective container with label so you can easily distinguish them. Collet must be placed into collet chuck nut before inserting into collet chuck. Suitable for drilling, tapping, engraving, CNC, spindle machines, and other processing. <strong>Specification:</strong> Material: 65Mn spring steel Model: ER11 Range: 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 1/8", 1/4" Height: 18mm / 0.7" OD: 10mm / 0.39" Run-Out Tolerance: &lt;0.008mm Weight: 127g (approx.) <strong>Package Includes:</strong> 1 Set(15pcs) x Collets <strong>Note:</strong> 1. Please allow 1-2mm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. Package List